1 /* 2 * Generic routines and proc interface for ELD(EDID Like Data) information 3 * 4 * Copyright(c) 2008 Intel Corporation. 5 * 6 * Authors: 7 * Wu Fengguang <wfg@linux.intel.com> 8 * 9 * This driver is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This driver is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 22 */ 23 24 #include <linux/init.h> 25 #include <linux/slab.h> 26 #include <sound/core.h> 27 #include <asm/unaligned.h> 28 #include "hda_codec.h" 29 #include "hda_local.h" 30 31 enum eld_versions { 32 ELD_VER_CEA_861D = 2, 33 ELD_VER_PARTIAL = 31, 34 }; 35 36 enum cea_edid_versions { 37 CEA_EDID_VER_NONE = 0, 38 CEA_EDID_VER_CEA861 = 1, 39 CEA_EDID_VER_CEA861A = 2, 40 CEA_EDID_VER_CEA861BCD = 3, 41 CEA_EDID_VER_RESERVED = 4, 42 }; 43 44 static char *cea_speaker_allocation_names[] = { 45 /* 0 */ "FL/FR", 46 /* 1 */ "LFE", 47 /* 2 */ "FC", 48 /* 3 */ "RL/RR", 49 /* 4 */ "RC", 50 /* 5 */ "FLC/FRC", 51 /* 6 */ "RLC/RRC", 52 /* 7 */ "FLW/FRW", 53 /* 8 */ "FLH/FRH", 54 /* 9 */ "TC", 55 /* 10 */ "FCH", 56 }; 57 58 static char *eld_connection_type_names[4] = { 59 "HDMI", 60 "DisplayPort", 61 "2-reserved", 62 "3-reserved" 63 }; 64 65 enum cea_audio_coding_types { 66 AUDIO_CODING_TYPE_REF_STREAM_HEADER = 0, 67 AUDIO_CODING_TYPE_LPCM = 1, 68 AUDIO_CODING_TYPE_AC3 = 2, 69 AUDIO_CODING_TYPE_MPEG1 = 3, 70 AUDIO_CODING_TYPE_MP3 = 4, 71 AUDIO_CODING_TYPE_MPEG2 = 5, 72 AUDIO_CODING_TYPE_AACLC = 6, 73 AUDIO_CODING_TYPE_DTS = 7, 74 AUDIO_CODING_TYPE_ATRAC = 8, 75 AUDIO_CODING_TYPE_SACD = 9, 76 AUDIO_CODING_TYPE_EAC3 = 10, 77 AUDIO_CODING_TYPE_DTS_HD = 11, 78 AUDIO_CODING_TYPE_MLP = 12, 79 AUDIO_CODING_TYPE_DST = 13, 80 AUDIO_CODING_TYPE_WMAPRO = 14, 81 AUDIO_CODING_TYPE_REF_CXT = 15, 82 /* also include valid xtypes below */ 83 AUDIO_CODING_TYPE_HE_AAC = 15, 84 AUDIO_CODING_TYPE_HE_AAC2 = 16, 85 AUDIO_CODING_TYPE_MPEG_SURROUND = 17, 86 }; 87 88 enum cea_audio_coding_xtypes { 89 AUDIO_CODING_XTYPE_HE_REF_CT = 0, 90 AUDIO_CODING_XTYPE_HE_AAC = 1, 91 AUDIO_CODING_XTYPE_HE_AAC2 = 2, 92 AUDIO_CODING_XTYPE_MPEG_SURROUND = 3, 93 AUDIO_CODING_XTYPE_FIRST_RESERVED = 4, 94 }; 95 96 static char *cea_audio_coding_type_names[] = { 97 /* 0 */ "undefined", 98 /* 1 */ "LPCM", 99 /* 2 */ "AC-3", 100 /* 3 */ "MPEG1", 101 /* 4 */ "MP3", 102 /* 5 */ "MPEG2", 103 /* 6 */ "AAC-LC", 104 /* 7 */ "DTS", 105 /* 8 */ "ATRAC", 106 /* 9 */ "DSD (One Bit Audio)", 107 /* 10 */ "E-AC-3/DD+ (Dolby Digital Plus)", 108 /* 11 */ "DTS-HD", 109 /* 12 */ "MLP (Dolby TrueHD)", 110 /* 13 */ "DST", 111 /* 14 */ "WMAPro", 112 /* 15 */ "HE-AAC", 113 /* 16 */ "HE-AACv2", 114 /* 17 */ "MPEG Surround", 115 }; 116 117 /* 118 * The following two lists are shared between 119 * - HDMI audio InfoFrame (source to sink) 120 * - CEA E-EDID Extension (sink to source) 121 */ 122 123 /* 124 * SS1:SS0 index => sample size 125 */ 126 static int cea_sample_sizes[4] = { 127 0, /* 0: Refer to Stream Header */ 128 AC_SUPPCM_BITS_16, /* 1: 16 bits */ 129 AC_SUPPCM_BITS_20, /* 2: 20 bits */ 130 AC_SUPPCM_BITS_24, /* 3: 24 bits */ 131 }; 132 133 /* 134 * SF2:SF1:SF0 index => sampling frequency 135 */ 136 static int cea_sampling_frequencies[8] = { 137 0, /* 0: Refer to Stream Header */ 138 SNDRV_PCM_RATE_32000, /* 1: 32000Hz */ 139 SNDRV_PCM_RATE_44100, /* 2: 44100Hz */ 140 SNDRV_PCM_RATE_48000, /* 3: 48000Hz */ 141 SNDRV_PCM_RATE_88200, /* 4: 88200Hz */ 142 SNDRV_PCM_RATE_96000, /* 5: 96000Hz */ 143 SNDRV_PCM_RATE_176400, /* 6: 176400Hz */ 144 SNDRV_PCM_RATE_192000, /* 7: 192000Hz */ 145 }; 146 147 static unsigned int hdmi_get_eld_data(struct hda_codec *codec, hda_nid_t nid, 148 int byte_index) 149 { 150 unsigned int val; 151 152 val = snd_hda_codec_read(codec, nid, 0, 153 AC_VERB_GET_HDMI_ELDD, byte_index); 154 #ifdef BE_PARANOID 155 printk(KERN_INFO "HDMI: ELD data byte %d: 0x%x\n", byte_index, val); 156 #endif 157 return val; 158 } 159 160 #define GRAB_BITS(buf, byte, lowbit, bits) \ 161 ({ \ 162 BUILD_BUG_ON(lowbit > 7); \ 163 BUILD_BUG_ON(bits > 8); \ 164 BUILD_BUG_ON(bits <= 0); \ 165 \ 166 (buf[byte] >> (lowbit)) & ((1 << (bits)) - 1); \ 167 }) 168 169 static void hdmi_update_short_audio_desc(struct cea_sad *a, 170 const unsigned char *buf) 171 { 172 int i; 173 int val; 174 175 val = GRAB_BITS(buf, 1, 0, 7); 176 a->rates = 0; 177 for (i = 0; i < 7; i++) 178 if (val & (1 << i)) 179 a->rates |= cea_sampling_frequencies[i + 1]; 180 181 a->channels = GRAB_BITS(buf, 0, 0, 3); 182 a->channels++; 183 184 a->sample_bits = 0; 185 a->max_bitrate = 0; 186 187 a->format = GRAB_BITS(buf, 0, 3, 4); 188 switch (a->format) { 189 case AUDIO_CODING_TYPE_REF_STREAM_HEADER: 190 snd_printd(KERN_INFO 191 "HDMI: audio coding type 0 not expected\n"); 192 break; 193 194 case AUDIO_CODING_TYPE_LPCM: 195 val = GRAB_BITS(buf, 2, 0, 3); 196 for (i = 0; i < 3; i++) 197 if (val & (1 << i)) 198 a->sample_bits |= cea_sample_sizes[i + 1]; 199 break; 200 201 case AUDIO_CODING_TYPE_AC3: 202 case AUDIO_CODING_TYPE_MPEG1: 203 case AUDIO_CODING_TYPE_MP3: 204 case AUDIO_CODING_TYPE_MPEG2: 205 case AUDIO_CODING_TYPE_AACLC: 206 case AUDIO_CODING_TYPE_DTS: 207 case AUDIO_CODING_TYPE_ATRAC: 208 a->max_bitrate = GRAB_BITS(buf, 2, 0, 8); 209 a->max_bitrate *= 8000; 210 break; 211 212 case AUDIO_CODING_TYPE_SACD: 213 break; 214 215 case AUDIO_CODING_TYPE_EAC3: 216 break; 217 218 case AUDIO_CODING_TYPE_DTS_HD: 219 break; 220 221 case AUDIO_CODING_TYPE_MLP: 222 break; 223 224 case AUDIO_CODING_TYPE_DST: 225 break; 226 227 case AUDIO_CODING_TYPE_WMAPRO: 228 a->profile = GRAB_BITS(buf, 2, 0, 3); 229 break; 230 231 case AUDIO_CODING_TYPE_REF_CXT: 232 a->format = GRAB_BITS(buf, 2, 3, 5); 233 if (a->format == AUDIO_CODING_XTYPE_HE_REF_CT || 234 a->format >= AUDIO_CODING_XTYPE_FIRST_RESERVED) { 235 snd_printd(KERN_INFO 236 "HDMI: audio coding xtype %d not expected\n", 237 a->format); 238 a->format = 0; 239 } else 240 a->format += AUDIO_CODING_TYPE_HE_AAC - 241 AUDIO_CODING_XTYPE_HE_AAC; 242 break; 243 } 244 } 245 246 /* 247 * Be careful, ELD buf could be totally rubbish! 248 */ 249 static int hdmi_update_eld(struct hdmi_eld *e, 250 const unsigned char *buf, int size) 251 { 252 int mnl; 253 int i; 254 255 e->eld_ver = GRAB_BITS(buf, 0, 3, 5); 256 if (e->eld_ver != ELD_VER_CEA_861D && 257 e->eld_ver != ELD_VER_PARTIAL) { 258 snd_printd(KERN_INFO "HDMI: Unknown ELD version %d\n", 259 e->eld_ver); 260 goto out_fail; 261 } 262 263 e->eld_size = size; 264 e->baseline_len = GRAB_BITS(buf, 2, 0, 8); 265 mnl = GRAB_BITS(buf, 4, 0, 5); 266 e->cea_edid_ver = GRAB_BITS(buf, 4, 5, 3); 267 268 e->support_hdcp = GRAB_BITS(buf, 5, 0, 1); 269 e->support_ai = GRAB_BITS(buf, 5, 1, 1); 270 e->conn_type = GRAB_BITS(buf, 5, 2, 2); 271 e->sad_count = GRAB_BITS(buf, 5, 4, 4); 272 273 e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2; 274 e->spk_alloc = GRAB_BITS(buf, 7, 0, 7); 275 276 e->port_id = get_unaligned_le64(buf + 8); 277 278 /* not specified, but the spec's tendency is little endian */ 279 e->manufacture_id = get_unaligned_le16(buf + 16); 280 e->product_id = get_unaligned_le16(buf + 18); 281 282 if (mnl > ELD_MAX_MNL) { 283 snd_printd(KERN_INFO "HDMI: MNL is reserved value %d\n", mnl); 284 goto out_fail; 285 } else if (ELD_FIXED_BYTES + mnl > size) { 286 snd_printd(KERN_INFO "HDMI: out of range MNL %d\n", mnl); 287 goto out_fail; 288 } else 289 strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1); 290 291 for (i = 0; i < e->sad_count; i++) { 292 if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) { 293 snd_printd(KERN_INFO "HDMI: out of range SAD %d\n", i); 294 goto out_fail; 295 } 296 hdmi_update_short_audio_desc(e->sad + i, 297 buf + ELD_FIXED_BYTES + mnl + 3 * i); 298 } 299 300 return 0; 301 302 out_fail: 303 e->eld_ver = 0; 304 return -EINVAL; 305 } 306 307 int snd_hdmi_get_eld_size(struct hda_codec *codec, hda_nid_t nid) 308 { 309 return snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE, 310 AC_DIPSIZE_ELD_BUF); 311 } 312 313 int snd_hdmi_get_eld(struct hdmi_eld *eld, 314 struct hda_codec *codec, hda_nid_t nid) 315 { 316 int i; 317 int ret; 318 int size; 319 unsigned char *buf; 320 321 if (!eld->eld_valid) 322 return -ENOENT; 323 324 size = snd_hdmi_get_eld_size(codec, nid); 325 if (size == 0) { 326 /* wfg: workaround for ASUS P5E-VM HDMI board */ 327 snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n"); 328 size = 128; 329 } 330 if (size < ELD_FIXED_BYTES || size > PAGE_SIZE) { 331 snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size); 332 return -ERANGE; 333 } 334 335 buf = kmalloc(size, GFP_KERNEL); 336 if (!buf) 337 return -ENOMEM; 338 339 for (i = 0; i < size; i++) { 340 unsigned int val = hdmi_get_eld_data(codec, nid, i); 341 if (!(val & AC_ELDD_ELD_VALID)) { 342 if (!i) { 343 snd_printd(KERN_INFO 344 "HDMI: invalid ELD data\n"); 345 ret = -EINVAL; 346 goto error; 347 } 348 snd_printd(KERN_INFO 349 "HDMI: invalid ELD data byte %d\n", i); 350 val = 0; 351 } else 352 val &= AC_ELDD_ELD_DATA; 353 buf[i] = val; 354 } 355 356 ret = hdmi_update_eld(eld, buf, size); 357 358 error: 359 kfree(buf); 360 return ret; 361 } 362 363 static void hdmi_show_short_audio_desc(struct cea_sad *a) 364 { 365 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE]; 366 char buf2[8 + SND_PRINT_BITS_ADVISED_BUFSIZE] = ", bits ="; 367 368 if (!a->format) 369 return; 370 371 snd_print_pcm_rates(a->rates, buf, sizeof(buf)); 372 373 if (a->format == AUDIO_CODING_TYPE_LPCM) 374 snd_print_pcm_bits(a->sample_bits, buf2 + 8, sizeof(buf2) - 8); 375 else if (a->max_bitrate) 376 snprintf(buf2, sizeof(buf2), 377 ", max bitrate = %d", a->max_bitrate); 378 else 379 buf2[0] = '\0'; 380 381 printk(KERN_INFO "HDMI: supports coding type %s:" 382 " channels = %d, rates =%s%s\n", 383 cea_audio_coding_type_names[a->format], 384 a->channels, 385 buf, 386 buf2); 387 } 388 389 void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen) 390 { 391 int i, j; 392 393 for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) { 394 if (spk_alloc & (1 << i)) 395 j += snprintf(buf + j, buflen - j, " %s", 396 cea_speaker_allocation_names[i]); 397 } 398 buf[j] = '\0'; /* necessary when j == 0 */ 399 } 400 401 void snd_hdmi_show_eld(struct hdmi_eld *e) 402 { 403 int i; 404 405 printk(KERN_INFO "HDMI: detected monitor %s at connection type %s\n", 406 e->monitor_name, 407 eld_connection_type_names[e->conn_type]); 408 409 if (e->spk_alloc) { 410 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE]; 411 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf)); 412 printk(KERN_INFO "HDMI: available speakers:%s\n", buf); 413 } 414 415 for (i = 0; i < e->sad_count; i++) 416 hdmi_show_short_audio_desc(e->sad + i); 417 } 418 419 #ifdef CONFIG_PROC_FS 420 421 static void hdmi_print_sad_info(int i, struct cea_sad *a, 422 struct snd_info_buffer *buffer) 423 { 424 char buf[SND_PRINT_RATES_ADVISED_BUFSIZE]; 425 426 snd_iprintf(buffer, "sad%d_coding_type\t[0x%x] %s\n", 427 i, a->format, cea_audio_coding_type_names[a->format]); 428 snd_iprintf(buffer, "sad%d_channels\t\t%d\n", i, a->channels); 429 430 snd_print_pcm_rates(a->rates, buf, sizeof(buf)); 431 snd_iprintf(buffer, "sad%d_rates\t\t[0x%x]%s\n", i, a->rates, buf); 432 433 if (a->format == AUDIO_CODING_TYPE_LPCM) { 434 snd_print_pcm_bits(a->sample_bits, buf, sizeof(buf)); 435 snd_iprintf(buffer, "sad%d_bits\t\t[0x%x]%s\n", 436 i, a->sample_bits, buf); 437 } 438 439 if (a->max_bitrate) 440 snd_iprintf(buffer, "sad%d_max_bitrate\t%d\n", 441 i, a->max_bitrate); 442 443 if (a->profile) 444 snd_iprintf(buffer, "sad%d_profile\t\t%d\n", i, a->profile); 445 } 446 447 static void hdmi_print_eld_info(struct snd_info_entry *entry, 448 struct snd_info_buffer *buffer) 449 { 450 struct hdmi_eld *e = entry->private_data; 451 char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE]; 452 int i; 453 static char *eld_versoin_names[32] = { 454 "reserved", 455 "reserved", 456 "CEA-861D or below", 457 [3 ... 30] = "reserved", 458 [31] = "partial" 459 }; 460 static char *cea_edid_version_names[8] = { 461 "no CEA EDID Timing Extension block present", 462 "CEA-861", 463 "CEA-861-A", 464 "CEA-861-B, C or D", 465 [4 ... 7] = "reserved" 466 }; 467 468 snd_iprintf(buffer, "monitor_present\t\t%d\n", e->monitor_present); 469 snd_iprintf(buffer, "eld_valid\t\t%d\n", e->eld_valid); 470 if (!e->eld_valid) 471 return; 472 snd_iprintf(buffer, "monitor_name\t\t%s\n", e->monitor_name); 473 snd_iprintf(buffer, "connection_type\t\t%s\n", 474 eld_connection_type_names[e->conn_type]); 475 snd_iprintf(buffer, "eld_version\t\t[0x%x] %s\n", e->eld_ver, 476 eld_versoin_names[e->eld_ver]); 477 snd_iprintf(buffer, "edid_version\t\t[0x%x] %s\n", e->cea_edid_ver, 478 cea_edid_version_names[e->cea_edid_ver]); 479 snd_iprintf(buffer, "manufacture_id\t\t0x%x\n", e->manufacture_id); 480 snd_iprintf(buffer, "product_id\t\t0x%x\n", e->product_id); 481 snd_iprintf(buffer, "port_id\t\t\t0x%llx\n", (long long)e->port_id); 482 snd_iprintf(buffer, "support_hdcp\t\t%d\n", e->support_hdcp); 483 snd_iprintf(buffer, "support_ai\t\t%d\n", e->support_ai); 484 snd_iprintf(buffer, "audio_sync_delay\t%d\n", e->aud_synch_delay); 485 486 snd_print_channel_allocation(e->spk_alloc, buf, sizeof(buf)); 487 snd_iprintf(buffer, "speakers\t\t[0x%x]%s\n", e->spk_alloc, buf); 488 489 snd_iprintf(buffer, "sad_count\t\t%d\n", e->sad_count); 490 491 for (i = 0; i < e->sad_count; i++) 492 hdmi_print_sad_info(i, e->sad + i, buffer); 493 } 494 495 static void hdmi_write_eld_info(struct snd_info_entry *entry, 496 struct snd_info_buffer *buffer) 497 { 498 struct hdmi_eld *e = entry->private_data; 499 char line[64]; 500 char name[64]; 501 char *sname; 502 long long val; 503 unsigned int n; 504 505 while (!snd_info_get_line(buffer, line, sizeof(line))) { 506 if (sscanf(line, "%s %llx", name, &val) != 2) 507 continue; 508 /* 509 * We don't allow modification to these fields: 510 * monitor_name manufacture_id product_id 511 * eld_version edid_version 512 */ 513 if (!strcmp(name, "monitor_present")) 514 e->monitor_present = val; 515 else if (!strcmp(name, "eld_valid")) 516 e->eld_valid = val; 517 else if (!strcmp(name, "connection_type")) 518 e->conn_type = val; 519 else if (!strcmp(name, "port_id")) 520 e->port_id = val; 521 else if (!strcmp(name, "support_hdcp")) 522 e->support_hdcp = val; 523 else if (!strcmp(name, "support_ai")) 524 e->support_ai = val; 525 else if (!strcmp(name, "audio_sync_delay")) 526 e->aud_synch_delay = val; 527 else if (!strcmp(name, "speakers")) 528 e->spk_alloc = val; 529 else if (!strcmp(name, "sad_count")) 530 e->sad_count = val; 531 else if (!strncmp(name, "sad", 3)) { 532 sname = name + 4; 533 n = name[3] - '0'; 534 if (name[4] >= '0' && name[4] <= '9') { 535 sname++; 536 n = 10 * n + name[4] - '0'; 537 } 538 if (n >= ELD_MAX_SAD) 539 continue; 540 if (!strcmp(sname, "_coding_type")) 541 e->sad[n].format = val; 542 else if (!strcmp(sname, "_channels")) 543 e->sad[n].channels = val; 544 else if (!strcmp(sname, "_rates")) 545 e->sad[n].rates = val; 546 else if (!strcmp(sname, "_bits")) 547 e->sad[n].sample_bits = val; 548 else if (!strcmp(sname, "_max_bitrate")) 549 e->sad[n].max_bitrate = val; 550 else if (!strcmp(sname, "_profile")) 551 e->sad[n].profile = val; 552 if (n >= e->sad_count) 553 e->sad_count = n + 1; 554 } 555 } 556 } 557 558 559 int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld, 560 int index) 561 { 562 char name[32]; 563 struct snd_info_entry *entry; 564 int err; 565 566 snprintf(name, sizeof(name), "eld#%d.%d", codec->addr, index); 567 err = snd_card_proc_new(codec->bus->card, name, &entry); 568 if (err < 0) 569 return err; 570 571 snd_info_set_text_ops(entry, eld, hdmi_print_eld_info); 572 entry->c.text.write = hdmi_write_eld_info; 573 entry->mode |= S_IWUSR; 574 eld->proc_entry = entry; 575 576 return 0; 577 } 578 579 void snd_hda_eld_proc_free(struct hda_codec *codec, struct hdmi_eld *eld) 580 { 581 if (!codec->bus->shutdown && eld->proc_entry) { 582 snd_device_free(codec->bus->card, eld->proc_entry); 583 eld->proc_entry = NULL; 584 } 585 } 586 587 #endif /* CONFIG_PROC_FS */ 588 589 /* update PCM info based on ELD */ 590 void snd_hdmi_eld_update_pcm_info(struct hdmi_eld *eld, 591 struct hda_pcm_stream *hinfo) 592 { 593 u32 rates; 594 u64 formats; 595 unsigned int maxbps; 596 unsigned int channels_max; 597 int i; 598 599 /* assume basic audio support (the basic audio flag is not in ELD; 600 * however, all audio capable sinks are required to support basic 601 * audio) */ 602 rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | 603 SNDRV_PCM_RATE_48000; 604 formats = SNDRV_PCM_FMTBIT_S16_LE; 605 maxbps = 16; 606 channels_max = 2; 607 for (i = 0; i < eld->sad_count; i++) { 608 struct cea_sad *a = &eld->sad[i]; 609 rates |= a->rates; 610 if (a->channels > channels_max) 611 channels_max = a->channels; 612 if (a->format == AUDIO_CODING_TYPE_LPCM) { 613 if (a->sample_bits & AC_SUPPCM_BITS_20) { 614 formats |= SNDRV_PCM_FMTBIT_S32_LE; 615 if (maxbps < 20) 616 maxbps = 20; 617 } 618 if (a->sample_bits & AC_SUPPCM_BITS_24) { 619 formats |= SNDRV_PCM_FMTBIT_S32_LE; 620 if (maxbps < 24) 621 maxbps = 24; 622 } 623 } 624 } 625 626 /* restrict the parameters by the values the codec provides */ 627 hinfo->rates &= rates; 628 hinfo->formats &= formats; 629 hinfo->maxbps = min(hinfo->maxbps, maxbps); 630 hinfo->channels_max = min(hinfo->channels_max, channels_max); 631 } 632